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Bluesil ESA 7250 200 ml A + 20 ml B

Bluesil ESA 7250 200 ml A + 20 ml B

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Visually clear, high-strength 2-component platinum-cured silicone potting compound for electronics and optoelectronics — mixing ratio 10:1.

Visually clear, high-strength 2-component platinum-cured silicone potting compound (Shore A 52) for electronics potting, optoelectronics, and photovoltaic cells

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  • manufacturer
  • brand
  • mixing ratio
  • network type
  • Number of components
  • mixing ratio
  • UV resistance
  • Viscosity (uncrosslinked) (mPa·s)
  • Paint cured
  • Self-leveling
  • consistency
  • Pot life (min)
  • Tensile strength (MPa)
  • Elongation at break (%)
  • Tensile strength (N/mm)
  • Electrical insulation
  • food contact
  • Suitable for medical use
  • container

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Silicone ESA Bluesil 2-component silicone Elkem Swiss warehouse Addition Platinum Complete kit 1:1 Workshop Silicone gel Electronics Encapsulation Optically clear 200 ml

 
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(Availability will be confirmed after order placement)

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Ships from our Swiss warehouse Shipped within 24 hours Batch certificate 30-day invoice (B2B) Technical support
Shipping & Delivery

Usually 1 to 3 business days

Availability will be confirmed once the order is received.

Express logistics within Switzerland and Europe.

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Product Information

Internal reference: 40-7250AB.KT

HS Code: 39100000

Internal reference: 40-7250AB.KT
HS code: 39100000

Bluesil ESA 7250 200 ml A + 20 ml B
Bluesil ESA 7250 200 ml A + 20 ml B
Bluesil · Elkem Silicones · SKU 40-7250AB.KT

Bluesil ESA 7250 A & B is a visually clear, high-strength 2-component platinum-cured silicone potting compound (Shore A 52) designed for electronics potting, optoelectronics, and photovoltaic cells.

This product line includes optically clear two-component polyaddition silicone elastomers for electronics encapsulation, optoelectronics, and photovoltaic cells—featuring a defined refractive index and high transparency. ESA 7250 is tailored to specific industrial applications—see below for its key properties and applications.

High-quality + visually clear

Bluesil ESA 7250 combines excellent mechanical properties (6.2 MPa tensile strength, Shore A 52) with optical clarity. 10:1 mixing ratio, 4-hour pot life, refractive index 1.406 — a proven industry standard for optoelectronics and high-performance encapsulation.

ESA 7250 by the Numbers
Visually clear
Transparent
Shore A 52
hardness
6.2 MPa
tensile strength
4 h
pot life

What sets the ESA 7250 apart

Visually clear
Direct view of encapsulated components — suitable for visible connections.
High-strength (Shore A 52, 6.2 MPa)
Durable vulcanized material — protects components subject to mechanical stress.
Low-viscosity mixture
4,000 mPa·s — easy to degas and pour.
Long pot life (4 hours at 23 °C)
Careful processing, even with large volumes.
Definitive refractive index
n=1.406 — suitable for optical applications involving a refractive index jump.
Exceptional heat resistance
+200 °C for short periods, suitable for many industrial applications.

What is ESA 7250 used for?

Electronics Potting
Encapsulation of electronic components for high mechanical protection.
Optoelectronic connections
Optical fiber cladding with a step refractive index.
Photovoltaic cells
Insulation and protection of solar cells.
Mechanical-optical components
Where transparency AND mechanical strength are required.
Industrial Sensors
Encapsulation of high-performance sensors.
LED encapsulation
High-performance LEDs with a clear appearance.
Data Sheets & Safety Data Sheets
Complete TDS and SDS in German, English, and French — view online or download.
Go to the documents →

processing

1
Prepare the component
Place the component in the encapsulation mold, ensuring it is clean and dry. Align the optical axes.
2
Mix A and B
10:1 or 1:1 (see comparison table). Low-viscosity mixture — degasses easily.
3
Degassing
30–50 mbar vacuum — essential for a bubble-free finish.
4
Forget
Pour slowly into the mold—a refractive index of 1.40 makes the material optically clear.
5
curing
24–48 hours at 23 °C, or accelerated with heat up to 150 °C.

Recommended Accessories

Bluesil Inhibitor 3
Pot life extender for polyaddition silicone systems (Pt-Cure).
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Bluesil Primer PM 820
High-performance primer for polar plastics (PA, PES, ABS, PP) and composites.
Go to product →
Bluesil Primer 131
Universal bonding agent for stainless steel, aluminum, PMMA, and many metals.
Go to product →

Important information

Mixing & Dosage
Stir A and B thoroughly before each use. Use the exact proportions specified (see table above)—preferably by weight. Incorrect proportions will result in incomplete curing.
Degassing
De-gas the mixture under a vacuum of 30–50 mbar. The material expands to 3–4 times its original volume and shrinks back after 5–10 minutes. Interrupt the vacuum several times to improve degassing.
Avoid inhibitors
Polyaddition silicones are inhibited by: sulfur-cured rubber, tin-catalyzed RTV, amine epoxides, and PVC containing tin salts. If in doubt, conduct a preliminary test.
Application Consulting
SILITECH can advise you on the best RTV option for your application—substrate, hardness, pot life, and mechanical properties. Please contact us with details about your specific application.

ESA 7250 Compared to Related RTV Products

Crosslinking system, mechanics, and processing times listed side by side — all values taken from the official Elkem TDS. “— ” = not specified in the data sheet.

ESA 7250
Current Product		 RTV 141 →ESA 6110 →RTV 8352 LV →
Networking System2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt) Gel2K Polyaddition (Pt)
mixing ratio10 to 110 to 11 : 11 : 1
ColorVisually clear and colorlessTransparent, colorlessVisually clearWhitish
Shore A hardnessA 52A 50Gel (Penetration 250)A 55
elongation at break115 %120 %—78 %
tensile strength6.2 MPa6 MPa—2.3 MPa
tear resistance4 kN/m———
pot life4 h4 h50 min (hours) / 5 min (quality control)130 min
demolding time24–48 hours24–48 hours120–180 min8 h
Mixed viscosity4,000 mPa·s4,000 mPa·s1,200 mPa·s2,200 mPa·s
Main applicationElectronics PottingOptoelectronic connectionsElectronics Encapsulation (Potting)Electrical Engineering Encapsulation
Topics & Areas of Application
Keywords related to this product. Also useful for our search and filter functions.
Silicone ESA Bluesil 2-component silicone Elkem Swiss warehouse Addition Platinum Complete kit 1:1 Workshop Silicone gel Electronics Encapsulation Optically clear 200 ml

Technical specifications for Bluesil ESA 7250 200 ml A + 20 ml B

All 19 Product information 7 Additional features 1 Physical Properties 4 Curing values 1 Mechanical Properties 3 Electrical Properties 1 Product approvals 2
product information
manufacturer Elkem Silicones
brand Bluesil
mixing ratio 10 to 1
network type Addition (Platinum)
Number of components 2K (two-component)
mixing ratio 1:1
container 200 ml + 20 ml
Additional features
UV resistance Yes
Physical properties
Viscosity (uncrosslinked) (mPa·s) 4
Paint cured Transparent
Self-leveling Yes
consistency Flowable
curing values
Pot life (min) 4
Mechanical properties
Tensile strength (MPa) 6.2
Elongation at break (%) 115
Tensile strength (N/mm) 4
Electrical Properties
Electrical insulation Yes
product approvals
food contact No
Suitable for medical use No

For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.

No public documents available.
Upon request, we will be happy to send you the TDS and SDS via email. Please submit a request.

Frequently Asked Questions About ESA 7250

Practical questions regarding processing and design — answered by SILITECH.

Bluesil ESA 7250 A & B: Visually clear, high-strength 2-component platinum-cured silicone potting compound (Shore A 52) for electronics potting, optoelectronics, and photovoltaic cells. Primary applications include electronics potting, optoelectronic assemblies, and photovoltaic cells.

Polyaddition curing is a two-component silicone chemistry that uses a platinum catalyst. Component A contains the platinum complex, while Component B contains the SiH crosslinker. When mixed, the components cure without releasing reaction byproducts—no shrinkage due to outgassing, excellent dimensional accuracy, and low linear shrinkage. Important: Polyaddition silicones are inhibited by various substances—sulfur-vulcanized natural rubbers, tin-catalyzed RTV silicones, amine-catalyzed epoxy resins, and PVC stabilized with tin salts. If in doubt, a preliminary test should be conducted.

Stir components A and B thoroughly before each use. Measure out the exact amount according to the mixing ratio specified in the TDS (see comparison table above)—preferably by weight. Mix using an electric or pneumatic mixer at low speed (to minimize air entrapment). Degas the mixture under vacuum (30–50 mbar)—the material expands to 3–4 times its original volume, bubbles escape, and the material deflates after 5–10 minutes. Then slowly pour into the mold from the lowest point to avoid air entrapment. For polyaddition systems, avoid contact with inhibitors (sulfur rubber, tin RTV, amine epoxies, PVC with tin salts).

Store in the unopened original container in a dry, cool place—typically between +5 and +30 °C; see the TDS for exact values. Store components A and B separately; seal airtight after opening. Polyaddition systems are not sensitive to moisture but should be stored in a cool place to maintain pot life. Consult the Safety Data Sheet (SDS) before use.

In the comparison table above, you will find related RTV products with different hardness levels, pot lives, or application profiles. If you are unsure about the best choice, we would be happy to advise you—please contact SILITECH with details about your application (substrate, desired hardness, processing time, and requirements for mechanical properties and durability).

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product specifications

product information
manufacturer Elkem Silicones
brand Bluesil
mixing ratio 10 to 1
network type Addition (Platinum)
Number of components 2K (two-component)
mixing ratio 1:1
container 200 ml + 20 ml
Additional features
UV resistance Yes
Physical properties
Viscosity (uncrosslinked) (mPa·s) 4
Paint cured Transparent
Self-leveling Yes
consistency Flowable
curing values
Pot life (min) 4
Mechanical properties
Tensile strength (MPa) 6.2
Elongation at break (%) 115
Tensile strength (N/mm) 4
Electrical Properties
Electrical insulation Yes
product approvals
food contact No
Suitable for medical use No
keywords
keywords
Silicone ESA Bluesil 2-component silicone Elkem Swiss warehouse Addition Platinum Complete kit 1:1 Workshop Silicone gel Electronics Encapsulation Optically clear 200 ml
processing
Viscosity of the mixture1,200 mPa·s
Viscosity Comp. A1,000 mPa·s
Viscosity Comp. B1,200 mPa·s
Pot life at 23°C40.0 min
Physical & Thermal
Density (23°C)0.98 g/cm³
Temperature resistance (duration)-50 to 200 °C
Peak temperature (short-term)200 °C
Electrical specifications
Dielectric constant ε (1 kHz)2.8
Dielectric strength23.0 kV/mm
Forward resistance1e+15 Ω·cm
Loss factor tan δ0.001
storage
Shelf life in original packaging12 months
Storage temperature-10 to 30 °C